الفهرس 
Importance of Feed AdditivesOnly 14 pages are availabe for public view
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Abstract
This study was carried out in a private farm under the supervision of Animal Production Department, Faculty of Agriculture, Tanta University from May to July 2020 to investigate the effect of different supplementation levels of allicin on broilers performance, some blood metabolites and antioxidants status of Cobb broilers.Three hundred unsexed 1-day old Cobb chicks with an initial live weight of were randomly distributed into five experimental groups with three replicates in each, with 20 chicks (5x3x20). They used to study the effects of different supplementation levels of allicin on broiler performance, some blood metabolites and antioxidant status. Each replicate was kept in a designated area of 1.5×2m floor pens until they reached 35 days of age. After hatching, birds were fed experimental diets. All birds were subjected to the same managerial, hygienic, and environmental conditions. The birds were grown in floor litter condition and subjected to 24 hrs lighting at the intensity of 3 watt/m2 during the experimental period which extended to 5 weeks of age. Diets were formulated to be isonitrogenous, isocaloric and cover all essential nutrient requirements for growing broiler chickens according to (NRC, 1994). All the dietary components were obtained commercially. The first group (T1) was fed the basal diet without any supplementation and served as control. Groups T2, T3, T4 and T5 were fed basal diet supplemented with 3, 6, 9 and 12 mg of allicin per kg diet, respectively. During the experimental period, body weight (BW), weight gain (WG), fed consumption (FC) and feed conversion ratio (FCR) were recorded weekly. At the end of the feeding trial, nine birds from each treatment were randomly selected weighed, fasted for 12 hrs prior to slaughter by slitting the jugular vein. Plasma and serum were obtained immediately and frozen rapidly in Eppendorf tubes until the time of analysis.